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Mattermost Boards EUVDEUVD-2026-77376

| CVE-2026-13417 MEDIUM
Improper Check for Unusual or Exceptional Conditions (CWE-754)
2026-09-14 Mattermost GHSA-mq74-c6v5-598g
Denial Of Service Mattermost
4.3
CVSS 3.1 · Vendor: Mattermost
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Severity by source

Vendor (Mattermost) PRIMARY
4.3 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
vuln.today AI
4.3 MEDIUM

Editor board access constitutes PR:L; availability impact is limited to the Boards plugin worker (A:L); no confidentiality or integrity impact applies.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Primary rating from Vendor (Mattermost).

CVSS VectorVendor: Mattermost

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

Lifecycle Timeline

2
Analysis Generated
Sep 15, 2026 - 07:10 vuln.today
CVE Published
Sep 14, 2026 - 10:44 cve.org
MEDIUM 4.3

DescriptionCVE.org

Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to validate the type of fields.properties on block creation which allows an authenticated user with editor access to a board to crash the Boards plugin worker and trigger a denial of service via a child block whose fields.properties is a non-object value. Mattermost Advisory ID: MMSA-2026-00710

AnalysisAI

The Boards plugin in Mattermost fails to validate the data type of fields.properties during block creation, enabling any authenticated user holding editor-level access on a board to crash the Boards plugin worker via a malformed child block. Four release branches are affected (10.11.x, 11.7.x, 11.8.x, 11.9.x). …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires two concrete prerequisites: (1) a valid authenticated Mattermost account on the target instance, and (2) editor-level access to at least one board, which is granted by a board owner or channel administrator. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The vendor-assigned CVSS 4.3 (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L) accurately reflects the real-world risk profile. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade Mattermost to a release beyond the affected version ranges documented in MMSA-2026-00710 at https://mattermost.com/security-updates. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-77376 vulnerability details – vuln.today
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